Example 05.08 Activity Coefficient of the Monomer in a Polymer Using the Athermal
Calculate the activity coefficient of the monomer in a polymer using the athermal Flory-Huggins equation. For the calculation the following volumes should be used:
v1 = 70 cm3/mol v2 = 70000 cm3/mol
Using equation 5.33, the activity coefficient can be calculated from the volume fractions q of the components in the mixture:
To avoid the singularity at the pure components, the following function V should be used, which provides identical values without the singularity.
Plotting the logarithm of the ratio of the activity coefficients as function of concentration leads to: